Total current assets Total assets Related Party Transaction [Axis] Total current liabilities Total long-term liabilities Total REX shareholders’ equity Total equity Balance Balance Total liabilities and equity Gross profit Gross profit Gross Profit Income before income taxes Income Before Taxes Net income Total consolidated net income Net income attributable to REX common shareholders Net income attributable to REX common shareholders Balance (in Shares) Balance (in Shares) Balance (in Shares) Balance (in Shares) Equity Components [Axis] Net cash provided by operating activities Net cash provided by investing activities Net cash used in financing activities Net increase in cash and cash equivalents Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Total Inventory Segments [Axis] Total lease expense Total Lessee, Operating Lease, Liability, to be Paid Total Finance Lease, Liability, to be Paid Financial Instrument [Axis] Fair Value Hierarchy and NAV [Axis] Total property and equipment Total Property and equipment, net Total Total Derivative Instrument [Axis] Investment, Name [Axis] Legal Entity [Axis] Non-Vested Shares, Beginning of Period Non-Vested Shares, End of Period Weighted Average Grant Date Fair Value, Beginning of Period Weighted Average Grant Date Fair Value, End of Period Weighted Average Vesting Term, Beginning of Period Weighted Average Vesting Term, End of Period Weighted average shares – diluted Weighted average shares outstanding – diluted (in Shares) Unrecognized tax benefits, beginning of year Unrecognized tax benefits, end of year Unrecognized tax benefits, end of year Unrecognized Tax Benefits Measurement Input Type [Axis] Document Type Document Quarterly Report Document Period End Date Document Fiscal Year Focus Document Transition Report Entity File Number Entity Registrant Name Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Address Line One Entity Address, City or Town Entity Address, State or Province Entity Address, Postal Zip Code City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Security Exchange Name Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Central Index Key Amendment Flag Document Fiscal Period Focus Current Fiscal Year End Date Assets Current assets: Cash and cash equivalents Short-term investments Accounts receivable Refundable income taxes Refundable income taxes Prepaid expenses and other Operating lease right-of-use assets Finance lease right-of-use assets Other assets Equity method investment Carrying Amount Liabilities and equity Current liabilities: Accounts payable – trade (includes $1.8 million and $1.4 million with related parties at July 31, 2025 and January 31, 2025, respectively) Accounts payable - trade, related parties Current operating lease liabilities Current finance lease liabilities Accrued expenses and other current liabilities Long-term liabilities: Deferred taxes Long-term operating lease liabilities Long-term finance lease liabilities Long-term taxes payable Other long-term liabilities Equity REX shareholders’ equity: Common stock Paid-in capital Retained earnings Noncontrolling interests Net sales and revenue Revenue by Product Net Sales and Revenue Cost of sales (includes $29,004 and $28,340 with related parties for the three months ended July 31, 2025 and 2024, respectively, and $53,853 and $58,987 with related parties for the six months ended July 31, 2025 and 2024, respectively.) Cost of Sales Cost of sales, related parties Equity in income of unconsolidated affiliates Income from equity method investments Interest and other income, net Weighted average shares outstanding – basic (in Shares) Weighted average shares – basic Basic net income per share attributable to REX common shareholders (in Dollars per share) Diluted net income per share attributable to REX common shareholders (in Dollars per share) Net (loss) income Treasury stock acquired Treasury stock acquired (in Shares) Issuance of equity awards, stock based compensation expense Issuance of equity awards, stock based compensation expense (in Shares) Cash flows from operating activities: Net income including noncontrolling interests Adjustments to reconcile net income to net cash provided by operating activities: Depreciation Amortization of operating lease right-of-use assets Amortization of finance lease right-of-use assets Dividends received from equity method investments Interest income from investments Deferred income tax Stock-based compensation expense Changes in assets and liabilities: Accounts payable, trade Long-term taxes payable Other liabilities Cash flows from investing activities: Maturity of short-term investments Proceeds from sale of real estate and property and equipment Cash flows from financing activities: Non-cash investing activities – Accrued capital expenditures Non-cash investing activities – Capital additions transferred from prepaid expense Non-cash financing activities – Stock awards accrued Non-cash financing activities – Stock awards issued Non-cash financing activities – Excise tax on stock repurchases accrued Operating right-of-use assets acquired and liabilities incurred upon lease commencement Finance right-of-use assets acquired and liabilities incurred upon lease commencement Treasury stock Selling, general and administrative expenses Provision for income taxes Provision for income taxes Income Tax Expense (Benefit) Net income attributable to noncontrolling interests Noncontrolling interests distribution and other Loss on disposal of property and equipment – net Accounts receivable Inventories Refundable income taxes Other assets Capital expenditures Purchase of short-term investments Deposits Treasury stock acquired Payments to noncontrolling interests holders Related Party [Member] Common Stock [Member] Treasury Stock, Common [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Noncontrolling Interest [Member] Condensed Financial Statements [Text Block] Significant Accounting Policies [Text Block] Schedule of Inventory, Current [Table Text Block] Ethanol and other finished goods Work in process Corn and other raw materials Revenue from Contract with Customer [Text Block] Schedule of Disaggregated Revenue by Product [Table Text Block] Lessee, Finance and Operating Leases [Text Block] Lease, Cost [Table Text Block] Operating lease expense Variable lease expense Total cash paid in measurement of lease liability Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Remainder of 2026 2027 2028 2029 2030 Thereafter Operating lease liabilities Finance Lease, Liability, to be Paid, Maturity [Table Text Block] Remainder of 2026 2027